Sta-Kon F2021 INS PP FERRULE 20, .5 MM2, LG .531

The F2021 is sized for 20 AWG conductor, which is 0.5 mm2 on the metric scale. Strip length should match the barrel; the ferrule's overall length is .531 inch. If your conductor is 18 AWG or larger, you need a bigger ferrule in the series, not this one.

White on the F2021 is the insulation color tied to the 0.5 mm2 / 20 AWG size, so color-coded ferrule systems let an electrician verify size at a glance in a crowded terminal block or control panel. Treat the color as a size indicator, not a finish choice.

The crimp barrel is copper, with a polypropylene insulating collar over it. Copper barrels are the standard for stranded-wire termination into screw terminals, DIN rail blocks and spring-cage connectors, and copper-to-plated-brass or plated-steel screw contact is normal practice in control wiring.

Wire ferrules need a ferrule crimper, not standard insulated-terminal pliers. The barrel is crimped square or hex around the full circumference so the strands are compressed uniformly; a standard oval terminal crimper deforms it on one axis and the ferrule will not seat properly in a terminal block. Use a 4-indent or hex ferrule tool with a die that covers 0.5 mm2.

A ferrule gathers the strands into a solid pin, so nothing frays out of the terminal, no strand gets pinched off under the screw, and the clamping force stays even over time. Most panel builders and machine-builder specs require ferrules on stranded control wire for exactly that reason. The polypropylene collar on the F2021 also keeps the insulation stripback covered right up to the terminal.

The F2021 is a single-conductor ferrule rated at 0.5 mm2 total barrel capacity, so it takes one 20 AWG wire. For two conductors going into one terminal you need a twin-entry ferrule, which has two insulation entries over one barrel, not this single-entry type.

These ferrules are manufactured in Germany. That matters on jobs with country-of-origin reporting requirements, such as government and institutional procurement where a COO declaration is part of the submittal package.

Order by the manufacturer part number F2021 for the white 20 AWG / 0.5 mm2 insulated ferrule at .531 inch length. Ferrules are size-specific, so if a panel uses several conductor gauges you order a separate part number per gauge rather than one catch-all size.